Ok I'll admit that when i first saw him, I was in the front yard. I picked him up and grabbed the camera because I knew I'd loose The shot if I left him and came back.
Second while waiting to grab the camera, (my wife was getting it) , I suddenly felt the grip of his mandibles. (yes they do hurt and yes my wife laughed at me and told me "thats what you get", along with a rather smug..."what did you expect?")
So When I put him down on the grass blade you see in the pictures, I was able to point my finger at him to get the shot. (I think he was ready to bite me again...)
As for why he didn't move when I pulled out the ruler... only he knows.

But he actually stayed put there for another 30 min or so after I finished.